Pasteurizing apparatus



NOV. 5, 1929. 1 H, GODFREY 1,734,571

PASTEUHIZ ING APPARATUS Nov. 5, 1929. J. H. GODFREY PASTEURIZING APPARATUS 6 Sheets-Sheet 2 Filed Aug. 22. 1927 WZIILWWMM Nov. 5, 1929. J. H. Gom-'REY 1,734,571

PASTEURI Z ING APPARATUS Filed Aug. 22, 1927 e sheets-sheet 5 lgwmf Joap/z H ofray,

Nov. 5, 1929.

J. H. GODFREY PASTEURIZING APPARATUS Filed Aug. 22. la?

6 Sheets-Sheet 4 Nov.`5, `1929. J, H GODFREY 1,734,571

PASTEURI Z ING APPARATUS Filed Aug. 22, 1927 6 Sheets-Sheet 5 V #l l I SD N km fes a J 'Q MN f N Q @I n dG3 l w n IM* f( D" I N s A *l & f

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/27 www@ NOV- 5, 1929. J. H. GoDFREY 1,734,571

PASTEURIZING APPARATUS Filed Aug. 2b. 1927 e sheets-sheet 6 Patented Nov.y 5, 1929 Unirse s'rATi-:sg PATENT OFFICE JOSEPH H. GODFREY, 0F CHICAGO, ILLINOIS, ASSIGNOR TO THE` CREAMERY PACKAGE MFG. COMPANY, OF CHICAGO, ILLINOIS, A`CORPORATION OF ILLINOIS PASTEURIZING APPARATUS Application led August 22, 1927.

The invention relates to pasteurizing apparatus more particularly adapted for the treatment ot edible fluids such as milk.

Experience in milk pasteurization has determined that the most effective and satisfactory method is to treat quantities of .the milk at a ypredetermined temperature for a predetermined time in suitable containers or conduits. In the commonly practiced use ot holding containers, the latter are filled .with the liquid milk which is held at the required temperature tor the required time and then emptied, the iilling and emptying being controlled by valves. yIt will be obvious that any leakage or failure in these valves permits the uncontrolled 'flow to or from the container of a quantity of milk Which has not been properly treated, and rintroduces the danger of reinoculation of the milk which has been properly pasteurized by the undes'troyed bacteria in the milk which has escaped the prescribed treatment.

The continuous flow type of pasteurizing apparatus, wherein a continuous stream ot the liquid milk is slowly conducted through relatively large heated conduits, isincapable oi positive control to the end that every part of the liquid is treated at the required teinperature for the required time, because et the more rapid flow of liquid currents within the larger stream which pass through the apparatus in less than the required time for the destruction of bacteria, and because of the retardation and over-treatment of quantities ot milk lying or moving out ot the direct current. v l

It is the principal object ot this invention to provide pasteurizing apparatus which is positive in its control ot every part of the mill; under treatment, withr the result that all of the milk is treated with certainty for not less than therequired period of time at the required temperatureto accomplish effective pasteurization.

Another object is to provide effective means in pasteurizing apparatus for positivelypdetermining the period oli' time that all portions of the milk is treated, without the use of controlling valves.

Another object is to provide in such appara- Serial No. 214,624.

tus for the positive separation into batches of quantities of milk in continuous movement during the treatment period.

Further objects include the provision of improved means for maintaining the temperature of the milk under treatment, and for handling the milk in its delivery to and discharge from the treating apparatus.

Other objects and advantages will be apparent in the following detailed description ot a preferred embodiment of the invention which I haveselected for illustration in the accompanying drawings. It will be understood, however, that various changes in form, construction and arrangement may be made by those skilled in the art, without departing from the scope and spirit of the invention as expressed in the appended claims. Reference is madey also to my co-pending application Serial No. 147,738 filed November 11, 1926 ot which this application is a continuation in part. y n y Referring' to the drawings, Figure 1 is a side elevation of the apparatus, with a portion broken away to illustrate in vertical section the internal construction.

F ig. 2 is a plan view, with a portion ot yeo the outer casing broken away to illustrate the internal arrangement.

Fig. 3 is a front end View in elevation.

Fig. 4 is a sectional detailed view ot' an air valve used in the apparatus.'

Fig. 5 is a rear end view in elevation, showing in section a part of the discharging mechanism.

Fig. 6 is a longitudinal. sectional elevation of the lf'ront portion ot the apparatus.

Fig. 7 is a longitudinal sectional elevation of the rear portion of the apparatus.

Figs. S and 9 are cross sectional views in elevation taken on the planes of the lines 8 8 and 9-9 respectively in F ig. 6.

Stated generally, the apparatus comprises a conduit series of coil chambers rinterconnected in substantially helical form and disposed around a central drum in which is contained a heating medium oit regulated temperature, the drum and conduit rotating as a unit on a horizontal axis. The milk preferably is pre-heated by other means to approxi- Vin passing through the apparatus.

- in the conduit. in )assino throuo'h the a a- Cil ratus at the maintained regulated temperature, is positively and accurately determined by the speed of rotation of the conduit, which is operated by regulated mechanical means.

More specifically described, with reference to the drawings, the numeral .l indicates a preferably cylindrical drum of rigid structure which is supported for rotation on a horizontal axis by bearing rings 2 and 3 respectively mounted on the front and rear ends thereof. Each of the bearing rings 2 and 3 is operatively supported on a pair of rollers l pivotally mounted in hrackets 5 rigidly secured to cross members 6 and 7 r-especively of the supporting frame. Side beams S and 9 form the main members of the supporting frame, the latter 1ceing supported on a plurality of conventional adjustable legs 10 to permit leveling of the apparatus when installed.

' Rotation of the drum is effected preferably by means of a ring gear 11 rigidly mounted on one of the bearing rings, in the Jresent instance on the front ring 2. il pinion 12 Fig. S), having driving engagement with the gear 11, lis mounted on a drive shaft 13. ifi-.ny suitable means may be employed for actuating the drive shaft at uniform speed, that herein illustrated comprising a worin gear 14 (Fig. 1) mounted on the shaft 13 and in driven engagement with a worin l5 carried by a shaft 16 upon which is mourned a sprocket 17, the latter having driven connection through a chain belt 13 with an electric motor 19, the worm and worin gear preferably being housed in conventional manner as indicated at 20. lilith uniform speed in the motor19, and proper ratio of speed reduction in the intermeciate driving train, the ring gear 1l and drum 1 are rotated at a speed effecting precise time intervals for the pasteurization process hereinafter described.

The drum above described illustrates the preferred means of support for the pasteurizing conduit, which, in the present instance is formed thereabout, the drum being further utilized for containing a heating medium as hereinafter described. @ther means of support and heat application may be used. however, Without departing from the essential characteristics of the pasteurizing conduit herein disclosed.

The conduit may be constructed in true helical form, as illustrated in my copending application above referred to, or in any other form of continuons coils or series of interconnecting chambers through which mill; may be caused to flow, by rotation of the structure, in positively separated batches and in determined periods of time. For effective performance and manufacturing convenience, I prefer the conduit construction herein illustrated. About the drum 1 preferably is secured a sheet covering 21 of a non-corrosive metal, forming alining for the milk conduit. Erected thereupon spaced partition plates 22 of similar material, extending rac iallyv from the covered drum ad forming a lonotiudinal series of like compartments or chambers.

rl`he plates 22 do vnot completely encircle the drum, thus providing a gap or opening between the spaced ends thereof, the openings preferably being alined longitudinally of the drum. rllhe opposite ends of the next successive partition plates are interconnected by angular partition plates 23 mounted on the drum c vering, which together with the plates 22 form a continuous passage or conduit about the drum from end to end thereof approximating a helical coil. Full end plates 2e and 25 are provided, forming outer lateral `walls for the respective end chambers, and a preferably cylindrical outer covering plate 26 'encloses the entire series of chambers or conduit. Any suitable means for sealing the joints between the partition plates and the in .er and outer cylindrical walls may be employed, as illustrated herein, base strips 27 are provided on the inner and outer walls, the strips having channels to receive the partition plates, and the whole being soldered or otherwise secured in assembly.

To minimize loss of heat by radiation through the exposed walls, an outer jacket 28 is provided about the outer and end walls of the conduit, the jacket being spaced from the walls and enclosing therebetween suitable insulating material 29.

Access for cleaning purposes, to all surface area of the interior of the conduit, is provided through a plurality of openings 30 in the outer wall and jacket. rlhe openings as shown herein are arranged in four longitudinal series, from which ready access may be had to every part of the conduit for scrubbing and sterilizing the milk passage after use. Each of the openings 30 is normally closed by a removable door 31 of any desired construction suitable to seal the openings when the apparatus is in use. That herein disclosed comprises a door plate 32 (Fig. 9) having a non-corrosive inner covering 33 seated upon an opening frame structure 3l sealed to the wall of the conduit. A latch plate 35, centrally pivoted on the outer side of the door plate 32, is provided with spaced radial beveled edge lugs which engage by rotation of the latch plate with overlying spaced lugs formed on the outer margin of the frame structure 34:, thus removably clamping the door in sealing contact with the opening frame structure. t

rlhe closed extremities oit the two end chambers, comprising the respective ends of the continuous conduit, are provided with openings indicated at 86 and 37 through the drum l, with which are respectively associated means for admitting milk to one end of the conduit in successive batches and in limited quantity to lill the lower portions of the turns of the conduit to a level substantially below the crest of the drum, and means for discharging the milk from the opposite end of the conduit when the milk has been passed through the length of the conduit by the rotation ot' the structure. Cleaning openings are provided in the outer wall and jacket, indicated at 38 and 39, radially outward of the ogfjenings 36 and 37, the openings being provided with removable closures similar in construction to those described for the openings 30.

r. he means herein illust-rai. controlling the admittance of the milk to the conduit, and tor discharging it therefrom, is preferred. It is contemplated, however, that many equivalent arrangements of means for admitting milk or other edible liquid in suc cessive separated quantities for pasteurization in a rotating conduit of continuous serial turns, may be made, as embraced in my invention. An advantage of the arrangement selected for illustration herein is that it permits the use of my pasteurizing apparatus between other purpose apparatus, commonly used in the treatment and packagingof milk and cream for consumption, which operato with a continuously flowing stream of the milk or cream.

The milk is admitted to the inlet end ot the conduit through a radially disposed tube i0 extending inwardly of the drum. The tube Ll() is ioined to a cup shaped fixture eil mounted in the drum wall and opening into the conduit and tube 40. y constructed with a flat bottom wall which is perpendicular to the tube 40, and which is "io oned, when the tube it() is in vertical pe.- on, al; the approximate .l ot the liquid in the conduit. In the rotation of the ronduit structure, in the direction indicated by the arrow (Fig. 9), the marginal edge Ll? of the iixture rises above the liquid level while the upper end of the tube L10 does not above that level maintained. as hereinafter described. Consequently, as the edge l2 rises al'iove tl e liquid level., there is immediate and positive cut-off of the batch which has been 'last admitted and at the same time the.

milk flow continues through the tube 4.0 for the beginning of the next successive batch without interruptiomthe separation being maintained by the cylindrical crest of the drum. f

rlfhe 'tube l0 is oined t0 3f tube 43 positioned The fixture il axially oi' the drum and extending outwardly oit the end the drum, the latter tube being rigidi supported in a head pla secured within and elt'ecting sealed of the end oi the drum. The oi. l tube communicates wih the tubular outlet lo of a level mail liow r ting device. The outlet e .iionary v. the tube i3 rotates with the conduit V and to compensate 'for such osci may occur between them a movable union is provides, proterably comprimir;` a double soc-liet member LMS in which are disposed in trictional e @agement a pair oit annular baYA members mounted rr-spectively on the ontw tube 43 and outlet a5. The outlet carried by an endwari adjustable casing e? having a pasi communication with the outlet fl-. ing reservoir 49 is mounted on the 3- to which the liquid milk or cream is eralnfvsuppli d in. continuous il tl i. pe 50 en' ing the side rlie reservoir communicates with the pass ge 48, t" e opf being` contr .ledbyavalveol 1 ed in. a slee about the openiuv asf# i The sleeve 52 prov trai ports controlled bythe pos.. wie vulve ol, "he latter in lowerrnost position and also seating upon the me o jonge g into the passage.

T i netwoen the resem on* Ll5) 48. A Ylloat 54 positioned i chamber or is supported by a ro-1l danig upward ot 'may be adjusted as to position in relation to i the lever 56. ,has controls the valve 5l, the

the pivot tulo? The :float fll milk rising in the 'float chan'iber rom the passage i8 and effecting the clef4 e oit the valve 5i, through i to the float., when f' .maximum height i in the paste it ben ded .n that .en

end cap 60 i rably mountet he outer end ofthe pass .ge e8, removable .or cleaning purposes and secured by any suitable irreans, as by a yoke 'Si and hand screw 62 mounted therein and engaging the ap to retain it in closed position.

lt will here be apparent that byl the maintenrce oit head of the milk in the passage i8 and tubes i3 and i0 at a level below the crest oi the drum l, the milk will ilow into the lili) conduit only to the height of th at maintained level. Therefore, as the fixture 4l and the connecting tubes 40 and 43 rotate with the drum and conduit structure, the milk will begin flowing' through the opening 36 into the inlet ond of the conduit when the tube 40 has passed the vertical position and begins to descend. The flow will continue while the tube 40 is carried around and again approaches the vertical, the milk passing into the advancing conduit end and filling the first turn or chamber thereof to the controlled maximum level. As the tube 40 reaches the vertical position, the marginal edge of the fixture 4l also reaches that level, and the further rotative movement carries the edge above the maintained le el, thus ending the filling of the one batch by interposing the crest of the drum adjacent the edge 42, and beginning` the filling' of the next batch. rlhe first batch then begins its flow through the angular passage into the next turn or chainber with the continued rotation of the conduit, the successive batches being at all times positively separated, throughout their travel through the pasteurizing conduit, by the crest of the cylindrical drum wall. lt will thus be seen that there is no possibility of the liquid contents of conduit passing through the conduit in less time than is determined by the speed of rotation of the conduit, and that there is no possibility of leakage or by-passing through faulty valves or otherwise which permits tne escape of any part of the batches of milk from treatment for the full period of time.

In maintaining the maximum level of liquid milk through operation of the valve 5l, it is desirable to provide excess capacity in the reservoir 49 so that variations in the rate of flow through the tube 40, due to the retardation of flow as the latter passes through its upper arc of movement, may be compensated for by a rising level of milk in the reservoir without disturbing the rate of flow in the inlet pipe 50.

Liquid tight engagement without undue friction between the socket member 46 and the engaging members carried by the tube 43 and outlet 45, is preferably maintained by mounting the casing 47 on a. longitudinally slidable support with resilient means tending to force it inwardly toward the member 46. rlhe casing 47 is mounted on a plate 63 having operative bearing support on a stationary lock 64, the latter having a central slot in its forward lower portion, and carrying a pair of upwardly extending spaced slideways 66 upon which rests the plate 68. A pair of slide bars 67 rigidly secured to the plate 63 cooperatively engage the slideways 66, thus permitting longitudinal'niovement of the casing while preventing lateral displacement. The block 64 is rigidly secured, as herein illustrated, to a horizontal section of channel 68 fixed upon an upright standard 69 mounted on one of the frame members, and braced by a rearward support 70 to another frame member.

Bearing upon the front edge of the plate 63, and tending` to move it inwardly upon the slideways 6 6, is a draw link 7l extending into the slot 65 and having pivotal attachment to one end of a lever 7:2, pivoted on a pin 73 mounted between the flanges of the channel 68. The lower end of the lever 7 2 pivotally connects with a push rod 74 extending into a housing 7 5 mounted on the standard 66, and containing a compression spring 76 bearing outwards upon a cross member carried by the rod 74. The casing 47 and its supported structures may be removed for cleaning by dropping the link 7l from Contact with the plate 63 and withdrawing the casing from its under supports.

Tubular connections at the rear end of the apparatus are provided for discharging the successive batches of milk from the pasteurizing conduit, of similar construction and operating in similar but reversed manner to control the outflow of milk. A fixture 77 is positioned at the outlet opening 37 in the rear extremity of the conduit, and opens into a radially positioned tube 7 8 joined to an arial tube 79 rigidly supported in a head plate 80 closing and rigidly supported in the rear end of the drum.

rlhe outer end of the tube 7 9 terminates over a discharge reservoir 8l, suitably supported thereunder, and preferably provided with an inclined pipe 82 to receive the discharged milk, the latter conducting the flow to the bott-om of the reservoir and avoiding excessive frothing of the milk by impactwith the surface of liquid in the reservoir. A regulated uniform flow from the reservoir 8l, in compensation for the batch discharges thereinto, is accomplished by float valve control comprising a tubular outlet 83 having an end closure and extending into a iioat chamber 84 positioned laterally of the reservoir. T he outlet 83 is provided with lateral ports 85 controlled by a rotatable sleeve valve 86 mounted on the outlet and actuated by a float 87 positioned in the chamber 84. An outlet pipe connection 8S leads from the chamber 84, and as the desired uniform liquid level in the chamber 84 is drawn down, the float valve operates to admit more liquid from the reservoir, thus providing uniform flow to the next apparatus in line.

In the passage of the batches of milk vthrough the pasteurizing' conduit, it is obvious that air spaces exist in the upper portions of the conduit coils between the separated batches. The introduction and discharge of the air between'the batches of milk, without disturbing the maintained level of liquid in the conduit, is accomplished by means of automatic valves positioned in the respective end walls of the conduit. At the front or inlet end of the conduit, an air valve is positioned in communication with the extreme end of the conduit, and preferablj.Y three other valves are provided at ninetyr degree intervals about the end wall of the conduit. As each valve in its upward travel passes tli maintained liquid level, the valve is automatically opened, and in its opposite do vnward movement, the valve is closed as it approaches the liquid level. By this means, air is admitted as the inlet end of the conduit rises above the liquid level, and the liquid is permitted to assume normal gravity .level without disturbance by the continued advance of the conduit end, which without such atmospheric relief would tend to draw the liquid over the crest of the drum. The plurality of air inlet valves assure a complete balance between liquid and air spaces in the progress of the batches through the apparatus.

fit the discharge end of the conduit, one air outlet valve suilices, the air rbeing discharged from the end of the conduit as the 6"* r approaches the liquid level, thus permitting the milk to travel to the end of the conduit without disturbance ofthe normal gravity level in the conduit.

The preferred construction of air valve is indicated generally at 89 and is illustrated in detail in Fig. 4. Referring to the latter ligure, a tubular casing 90 is mounted in the end rwall and outer liacket of the conduit, in sealed relation thereto, within which is positioned an inner valve casing 91 removably seated at y its inner end in abutment with a marginal flange provided on the outer casing 90. A union nut 92, overlying a peripheral liange formed on the casing 91 and having screwthreaded engagement `with the'outer` casing 90, secures the inner casing in normal position. f

At the inner end of the casing 91 a conventionally seated poppet valve 93 controls the air passage 94, and is supported on a stem 95 extending outward through the passage. A head 9G iixed on the stem 95 confines a compression spring 97 againsta cap 98 abutting the outer end of casing 91, the spring tending to retain the valve in closed position. An opening in the cap 9S accommodates the stem 95 and is of substantially larger diameter to admit air to the passage 94. The outer end of the air passage is preferably filled with filtering material 99 to remove impurities from the air entering the pasteurizing conduit.

The valves S9 are operated by front and rear cam bars 100 and 101 respectively, adapted to engage and depress the valve heads 96. The cam bars are positioned to engage the valve heads While the valves are passing above the liquid level, and yto release them While f niodating packing.

passing below the liquid level. The bars are preferably supported on standards 102 mounted on the main frame members.

For the maintenance of uniform temperature of the desired degree in the milk under pasteurizing treatment in the conduit, means are provided for circulating water of regulated ten'iperature through the interior of the drum 1. Each of the head plates 44 and 80 is provided a series of radial passages 103 inwardly communicating with the interior of the` drum and leading to a chamber 104 formed in the hub portion of the head plate about the respective tubes 43 and 79. Rotatably mounted on the respective tubes 43 and 79 is a sleeve 105 having endward bearings on the tribes. Tae intermedia-te portion of the sleeve is substantially spaced from the tube to form an annular chamber communi-r cating at its inner end with the hub chamber 104. K

The sleevek 105 remains stationary while the respective tubes passing therethrough rotate with the drum. Upon the hub portion of each of the head plates 44 and80 is provided a collar 106 concentric withand spaced from the inner end of the sleeve, the space accom- A conventional gland nut 107 is threaded on the collar 106. Ar similar packing gland construction is provided at the outer end of the sleeve 105 and indicated at 108./ Each of the sleeves 105 is held against rotation with its respective supporting tube by a rigid strap 109 secured to the side of the sleeve and extending downward into attachmeut with a stationary portion of the frame structure.

Secured to the front sleeve 105, and communicating with the annular' chamber therein, is a water pipe 110 leading to the suction side of a centrifugal pump 111 operated by a motor 112. A pipe 113 leads from the discharge side of the pump 111 to the rear end of the apparatus and is connected with the sleeve 105 on the discharge tube 79, thus completing a circuit for circulation of water through the drun 1 by the pump 111.

The water may be heated by injection of steam. A preferable arrangement as herein disclosed comprises a supply pipe 114 leading from a source of steam and having an automatic temperature controlled throttle 115 regulated by a therometric connection 116 with an adjacent portion of the water circulation pipe 113. Steam from the throttle 115 is passed through a pipe 117 to the forward end of the apparatus and there admitted to the water pipe 113 through a suitable valved injector 118, the water being tempered thereby in its return to the rear end and entry into the drum. Surplus water in the circulating system, caused by the added steam condensate, may be discharged through a riser pipe 119 connected with the pipe 113 and leading to any convenient place of discharge.

For record ot the maintenance of temperature in the milk during the pasteuriZinO' treatment, a recording thermometer 120 may be mounted conveniently on the discharge floatchamber 84C, and connected with a thermometer 121 installed in the millr discharge reservoir 8l.

It will here be apparent that the appara tus described accomplishes the positive timecontrolled pasteurization treatment ol' the millr, cream or other edible liquid passed' through the conduit, the time period being regulated by the speed ot rotation of the conduit, and without possibility of interminture ot the milk in one batch with that of another batch, as the successive batches are positivelyT separated at all times by the crest of the revolving drum forming a wall ot' the conduit. v Y

l claim as my invention:

l. Pasteurizing apparatus, comprising a conduit ot substantially helical form arranged for rotation about its axis and adaptcd to carry separated batches ot liquid in the lower turns thereof whereby said batches are progressively moved through said conduit by the rotation thereof. K

:2. Pasteurizing apparatus, comprising' a conduit formed of a series of successively interconnected coils rotatable about a common aXis and adapted to carry separated batches of liquid in the lower turns of said coils with the level ot said batches below the upper path ot' travel of said coils whereby the rotation ot said coils moves said batches therethrough in constantly separated relation.

3. Pasteurizing apparatus, comprising a rotatable liquid container having a series ot progressively connected chambers arranged about its axis to form a conduit tor the gravical movement of liquid therethrough with the rotation oit said container, said liquid being contained in separated batches in saidV chambers while said chambers are moving through the lower arcs of their paths ot movement and being maintained at a level below the upper arcs ot th ir paths ot movement.

41. Pasteurizing apparatus, comprising a conduit oi" substantially helical form arranged to rotate about its axis, and means tori intermittently admitting' liquid into said conduit whereby separated batches ot liquid are carried in the lower turns of said conduit and are progressively moved through said conduit with the rotation thereof.

5. Pasteurizing apparatus, comprising a conduit forming a series ot successively interconnected coils rotatable about a common anis, and means tor admitting liquid into said conduit in batches, said batches being arried in the lower turns of said coils with an upper level below the upper path of travel ot said coils whereby the rotation ot said coils moves said batches therethrough in separated relation.

6. ljasteurizing apparatus, comprising a conduit having the form ot a series of successively connected similar turns rotatable about a common aXis ata predetermined speed, and means for admitting successive batches of liquid into said conduit in quantities limited to levels below the highest path ot' travel of said turns whereby the liquid batches successively move through said turns in separated relation during a predetermined period ot time.

7. Pasteurizing apparat-us, comprising a rotatable liquid container having a series of progressively connected chambers arranged about its axis to form a conduit tor the gravital movement of liquid therethrough with the rotation of said container, and means for admitting a limited quantity of liquid to the endmostchamber while said chamber is moving through the lower arc of its path oi movement.

8. Pasteurizing apparatus, comprising a lheated conduit ot substantially helical form arranged to rotate about its axis, and means Yfor intermittenty admitting liquid into said conduit whereby separated batches of liquid are carried in the lower turns of said conduit and are progressively moved through said conduit with the rotation thereof.

9. Pasteurizing apparatus, comprising a heated conduit forming a series of successivelyinterconnected coils rotatable about a common asis, and means tor admitting liquid into said conduit in batches, said batches being carried in the lower turns of said coils, with an upper level below the upper path oi travel of said coils whereby the rotation ot said coils moves said batches therethrough in separated relation.

l0. Pasteurizing apparatus, comprising a uniformly heated conduit having the form ot a series ot successively connected similar turns rotatable about a common axis at a predetermined speed, and means for admitting successive batches ot liquid into said conduit in quantities limited to levels below the highest portion of the path ot travel of said turns whereby the liquid batches successively move through said turns in separated relation during a predetermined period ottime.

ll. Pasteurizing apparatus, comprising a rotatable holding container for heated liquid having a series of progressively connected chambers arranged about its axis to form a conduit tor the gravital movement ot said liquid therethrough with the rotation ot said container, and means for admitting a limited quantity or said liquid to the endinost chamber while said chamber is moving' through the lower arc ot its path of movement.

l2. Pasteurizing apparatus, comprising a conduit forming a series of successively connected coils rotatable about common and adapted tor the gravital movement ot liquid therethrough with the rotation of said maten coils, means for admitting a quantity oit liquid to one end of said conduit while said end is moving through the lower arc of its path of movement, and means for admitting air to said end oit the conduit while said und is moving through the upper arc ot its path of movement.

13. Pasteurizing apparatus, comprising a conduit forming a series ol successively connected coils rotatable about a common axis and adapted -for the gravital movement of liquid therethrough with the. rotation ot said coils, means for admitting a quant-ity of liquid to one end of said conduit while said end is moving through the lower arc of its path of movement, and means for admitting air to said end ot the conduit while said end is moving through the upper are ot its path of movement. n

14. Pasteurizing apparatus, comprising a rotatabley drum, a liquid conduit mounted upon said drum in the form of coils having a common axis with said drum, and means for admitting successive batches of liquid to one end ot' said conduit for gravital movement therethrough with the rotation ot said drum and coils.

15. Pasteurizing apparatus, comprising a rotatable drum, a liquid conduit mounted on said drum forming a. continuous series of coils having a common axis with said drum, means for admitting successive quantities of liquid to one end of said conduit while said end is moving through the lower portion off its path of movement, and an automat-ic valve controlling atmospheric communication with said conduit at said end, said valve being operable to admit air to said conduit only during the movement ol said end through the upper portion of its pat-h of revolution, thereby introducing air between the successive quantities of liquid in said conduit. y

1G. Pasteurizing apparatus, comprising a rotatablc'drum, a liquid conduit mounted about said drum forming a continuous series oit coils having a common axis with said drum, an inlet tube positioned axially in said drum and having a radial extension communicating with one end of said conduit, a liquid supply reservoir communicating l.for gravity flow with the axial portion or said inlet tube, the liquid level in 'said reservoir being limited in height to that below the uppermost side of said drum, thereby causing liquid to flow into said conduit only when the said end thereot moves below said liquidlevel, and means tor admitting air to said conduit when said end moves above said liquid level.

1.7. Pasteurizing apparatus, comprising a conduit forming a series of successively connected coils rotatable about a common axis and adapted for the gravital movementor liquid therethrough with the rotation of said Coils about their axes, a tube positioned in axial relation to said conduit having connection with one end thereof to form a liquid inlet, means torsupplying liquid to said axial tube by gravity flow under a head less than the height of the` underside of the uppermost portion of the path of movement or" said coils, thereby admitting liquid to said conduit in successive separated batches.

18. Pasteurizing apparatus, con'iprising a conduit forming a series oit successively connected coils rotatable about a. common axis and adapted for the gravital moven'ient of liquid therethrough with the rotation ot said coils about their axis, a tube positioned in axial relation to said conduit having connection with one end thereof to form a liquid inlet, means for supplying liquid to said axial tube by gravity flow under a head less than he height of the underside of the uppermost portion of the path of movementof said coils, thereby admitting liquid to said conduity in successive separated batches, and means for receiving liquid flowing from the other end ot' said conduit.

19.` Pasteurizing apparatus, comprising a rotatable drum, a liquid conduit mounted on said drum toi-ming a continuous series of coils having a common axis with said drum, means :tor admitting successive quantities of liquid to one end of said conduit while said end is moving through the lower portion ot its path of movement, means for admitting air between the successive quantities ot liquid, means for discharging said successive quantities of liquid from the other end ot said conduit while said other end is moving through the lower portion of its path of movement, rand an automatic valve controlling katmospheric communication with said conduit yat said latter end, said valve being operable to permit the discharge of air from said conduit only during the movement of said latter end through the upper portion of its path of movement thereby discharging the air between the successivequantities of liquid and the latter end ot said conduit as said batches move into said latter end.

20. "Fasteurizing apparatus, comprising a rotatable drum, a liquid conduit mounted about said drum forming a continuous series of coils thcreabout, means for admitting successive batches oitl liquid to one end of said conduit, the level of said batches of liquid being limited in height to that below the uppermost side of said drum, means for admitting air between said batches of liquid, an outlet` tube positioned axially in said drum and having a radial extension communicating with the outlet end of said conduit, thereby causing the liquid to flow out of said conduit only when said outlet end moves below said liquid level, and means for successively discharging the air between said batches from said conduit when said outlet end moves above said liquid level.

aznar ncction with one end thereof to torni a liquid inl t another tube positioned in axial relatio :aid conduit having connection with the other end thereof to form a liquid outlet, meaA s Yfor supplying liquid to said inlet tube by gravital flow under a head less than the height orn the underside of the uppermost portion of the path of movement oi said coils, thereby admitting liquid to said conduit in successive separated batches, said batches being maintained in separated relation while in said coils and successively dicharged theretrom through said outlet tube.

22. Pasteurizing apparatus, comprising a cylindrical drum operatively supported for rotation on a horizontal anis, radially positioned spaced plates mounted on said drum to form a substantially helical conduit thereabout, outer covering platesy enclosing said conduit, a tube axially positioned at one end of said drum and extending outwardly therefrom, said tube having` a connect-ion with one end of said helical conduit, an az al tube positioned outwardly of the other end of said drum and having connection with the other end oipv said conduit, said tubes and conduit being' adapted for the passage therethrough of liquid.

23. ln pasteurizing apparatus, a helical conduit supported for rotation upon its axis and adapted for the movement therethrough ot liquid, means for admitting liquid to one end ot said conduit in successive quantities to a level belo v the und -rside ot the uppermost path ot movement ot' the coils oit' said helical conduit, an air port in said end ot said conduit, valve controlling said air port, and cam means tor operating said valve adapted to open sain air port when the said end or" said conduit above the level ot said liquid ancL to close said air port when the said end ot said conduit passes below the level oit said liquid. Y

24. in pasteurizing apparatus, a helical conduit supported for rotation upon its axis and adapted for the movement therethrough of liquid, means for admitting liquid to one end ot said conduitin successive quantities to a level below the upper portion ot the pat-h of movement ot the coils of said helical conduit, an air port in said end of said conduit, a valve controlling said air port, and automatic means tor operating` said valve adapted to open said air port when the sait end of said conduit passes above the level ot said liquid and to close said air port when the said end of said conduit passes below the level oi said liquid.

25. Pasteurizing apparatus, comprising a substantially' helical conduit rotatable at a predetermined speed and having an inlet and outlet for the passage oi liquid therei, and means for limiting the level of the liquid within said conduit.

26. lasteurizing apparatus, comprising a ily helical conduit rotatable at a predetermined speed and having' an inlet and an outlet, means for introducing;Y liquid through said inlet in successive batches ot limited quantity, means ior introducingy air into said conduit alternatelyY to said batches of liquid.

27. Pasteurizing apparatus, comprising a substantially helical rotatable liquid conduit having` means for a controlled dow of liquid thereto, a plurality ot spaced openings in the wall et said conduit, and removable covers normally mounted in sealing relation to said openings.V

2S. Pasteurizing apparatus, comprising` a rotatable conduit ot substantially helical form adapted to contain liquid in separated batches and having an axial supply tube communicatingv with one end thereof, a reservoir for supplyingr liquid to said tube, and float controlled valve means for regulating the llow from said reservoir to said tube, said means being adapted to limit the maximum level of liquid admitted to said conduit.

29. ln pasteurizing apparatus having a substantially helical conduit rotatable on its longitudinal axis, an inwardly extending radial tube rotatable wtih said conduit and adapted to supply liquid thereto from a supply Vot predetermined level, and a cup-shaped member formino intermediate communication between said tube and the inner wall of said conduit, said cup-shaped member having its bottom wall perpendicular to the axis of said tube and positioned substantially at the level of the liquid to be supplied to said conduit, said bottom wall being extended at its rear side into intersection with the inner wall ot said conduit.

30. In pasteurizing apparatus having a substantially helical conduit adapted to receive liquid at one end in successive separated batches at a predetermined level, means for admitting air to said conduit between said separated batches comprisintqr a valve positioned in the wall of said conduit, means for openingsaid valve when said valve rises above the level ot the liquid admitted to said conduit, and means provided in said valve for iiltering the air passing through said valve.

3l. Pasteurizing apparatus comprising a means for conducting separated batches of liquid in continuous progressive movement therethrough, means for receiving a continuously flowing stream of liquid and delivering said liquid ni separated batches to said JOSEPH H. GODFREY. 

